Variation - Jamb Mathematics Past Questions and Answers

Question 26:

• JAMB 1986

If x varies directly as y³ and x = 2 when y = 1, find x when y = 5

A. 2
B. 10
C. 125
D. 250

Question 27:

• JAMB 1987

If P varies inversely as V and V varies directly as R², find the relationship between P and R given that R = 7 when P = 2

A. P = 98R²
B. PR² = 98
C. P = \(\frac{1}{98R^{2}}\)
D. P = \(\frac{PR^{2}}{98}\)

Question 28:

• JAMB 1988

If x varies inversely as the cube root of y and x = 1 when y = 8, find y when x = 3

A. \(\frac{1}{3}\)
B. \(\frac{2}{3}\)
C. \(\frac{8}{27}\)
D. \(\frac{4}{9}\)

Question 29:

• JAMB 1988

Simplify \(\frac{x - y}{x^{\frac{1}{3}} - x^{\frac{1}{3}}}\)

A. X² + xy + y²
B. X^{\(\frac{2}{3}\)} + x ^{\(\frac{1}{3}\)} + y^{\(\frac{2}{3}\)}
C. X^{\(\frac{2}{3}\)} - x^{\(\frac{1}{3}\)}y^{\(\frac{2}{3}\)}
D. Y^{\(\frac{2}{3}\)}

Question 30:

• JAMB 1989

The cost of dinner for a group of students is partly constant and partly varies directly as the number of students. If the cost is N74.00 when the number of is 20 and N96.00 when the number is 30, find the cost when there are 15 students

A. N68.50
B. N63.00
C. N60.00
D. N52.00